As you increase the skill you can have more than 2. I thought it was how the skill work, but now I never use it anymore. They last too short and dont do much damages. Actualy I find them pretty useless (or just for heal with another skill, but never trie).

Towers are excelent when used aggresivley against long range players that try to keep out of your range.

Place them forwards of the flags and get the towers on rooks sholders/head for maximum affect...

That's for the first level of the skill, second lets you have four I think, and third lets you have six. I've also experienced my towers destructing themselves, though never when I was near one. I think they have some sort of timer that counts down to self-destruction once you wander off. That's just a guess though, I really have no clue. I havent found them perticularily useful... if the enemy demigod has any ranged skills he'll be able to take them out without them firing back at him.

I've never been beat on the dmg chart at end of the game spamming towers, they arn't broken at all, they have a life timer.. which is realitivly short makign them high maintance.. No worries though.. higher the skill rating the longer they last.. Also get the skill reduction items.. one a favor, thats 20% and the other is... artifact i believe.  That reduces towers to a 4 sec cooldown.. makign it VERY easy to hold a lane by yourself.. to prevent ninja pushers.. which weaker players like to do.

Hes a great defense player.. but very mana based... and towers are just GODLY.. 8 of them up doing about 140-180 dmg a second(towers lvl 4)... is 1120-1440 dps+rooks hammer and rock roll+independant weapon.. no hero can come close to that.. and they won't come close to the towers.. makes it nice fort battles and such. 

P.S. Make sure you play with a friend. pugs are such a pain.. towers in pugs are meh.. since you can't communicate well with your team to use them.. To start off get three mana items first.. and sit in the back don't push your towers at first.. let them be a close fall back point for yoru friends...You will save more lives then sedna(w/e her name is).

Yes there is an internded timer on all of Rooks towers.

I used the towers to great effect the other day, I powered up to the full 8 and was spamming them like crazy in a 2v3 god killer match, the more the enemy's minions attack your towers rather than the map ones the more damage you have for a longer period of time. I too have noticed them crumble away after a while though and it's kind of a pain they can't be permanent until destroyed, i mean it's not like they have tons of health, even at max level...

So DEVS you need to realize the tower upgrades are currently useless, byt the time you raise three towers one crumbles, and you are supposed to spec into up to 8!!   These are INCREDIBLY useful if you also take rook's own lazer and then chain them from the base, linking all lazers for some massive defense.

PLEASE FIX!

Yeah, he's delusional. It's easy to get eight up, but I agree that they shouldn't die from some count down, that's annoying and adds nothing to the game.

Save for early game they're not exactly a threat.... you can only have 8 up for a short time and they all need to be in the same area. Doesn't seem all that useful to upgrade past 6 cause of it.

You can have more than 3. Just need some upgrade of mana or item like heart of life. I'm not an expert with them but in last game I see a rook build eight around him.

I'm still not really fan of them. I prefer the other skills ^^

I have tons of towers up all the time.  My favorite build in the game so far is completely tower based.  Early game towers are great for holding flags and killing creeps, more effective than hammer since you can pull back and heal while the tower still deals damage.

Once you get max towers and structural transfer you have near constant healing available as long as you're near a tower (which you always should be if you're fighting at all) making you one of the best front line tanks and a beast to take down with godplate or any decent armor really.

Teleport scrolls are indeed your best friend.

Citadel upgrades seem to be affecting rook towers too so if you're going for a tower build, buying the upgrades is a must.

I wish they'd last a little longer, though I never actually knew that the citadel upgrades affected the towers, so I may try that and see how the balance is. I just know that if I'm playing against a decent player I've never been able to keep more than four up at once, their HP is just too low late-game, and you really gotta focus on putting them up. Early game they don't get destroyed too easily, but the timer on them usually takes them down before they become too useful to me. The build doesn't seem too great unless you're playing with an unskilled or average player, and get alot of support from your allies.