I don't like the TS strategy, but I don't rely on walls or gates either.
I place, archers and skirmishers on the wall, with upgraded standard infantry where the enemy is likely to ladder or deploy towers. Fire arrows will reduce the effectiveness of both, as I noticed when a unit of urban cohorts was utterly annhilated when the tower collapsed through burning, just as the gate was about to open.
In front of the gate my most elite unit will, be placed. On the gatehouse entrances, go 2 of the second most elite units. I do this, so my elite unit is given support, and it cannot be flanked in the unlikely event the enemy takes my walls.
I place cavalry units, about 6 houses away on either side of the two second-most elite units. Just in case they get overrun, but they usually don't, as I noticed when MY urban cohorts and 2 praetorii cohorts turned the gate into a moshpit, with 5 units of heavy axemen and 2 berserkers. In all, the 3 units I had suffered 188 losses between them (huge unit scale ).My general will alway go in the square. I try to keep siege equipment out of towns as it tends to be useless. If there is any there however it'll go in the TS with the general, in case the town is likely to fall. They give a grand last stand.
St Jimmy
Angel face and a taste for suicidal