We experimented with IFA a few years ago in Detroit, tho we used the simple expedient of sticky tape across the front!
The battles usually ended with the 2 TD's desperately trying to out manoeuvre one another long after everyone else was dead. The lesson I took from that was it needed a large area with plenty of cover to allow for flanking / sneaking up on the TD, otherwise it was all rather tedious for the other guys to have to sit and wait for someone to make a mistake...

Another problem I've seen is that in a small or narrow battlefield, the IFA tank just backs up into a corner and sits there picking people off. It might be 'realistic', but it sure ain't fun for everyone else involved if they are physically unable to get to it.
With that in mind, you really do have to bend 'the rules' to allow both teams to have an equal number of IFA tanks, or else it simply isn't fair to the team that is without.

Also to add:
What I found worked better was to have buildings which had their windows low enough to allow tanks like the SU's and Stugs to shoot thru without exposing their apples. This way the TD had a limited cone of fire, and didn't gain as much of an advantage as the blocked sensor would when it was flushed out by the enemy.
That way you could set up the TD in ambush position's and your team mates had to protect its flanks - equally as realistic in terms of tactics and history, and makes for a more involving team game, eh?