IIRC, Mike McGrath shared some thoughts on what to do with T-34s in VotG in Journal 11. Although specific to CG IV, you may be able to glean some insight from his appreciation for the relative strengths and weaknesses of each side. For example, resist the urge to place a T-34 in G50, place cupolas in rubble and protect them with an adjacent unit, etc.
In any case, have a look at Mike's article. There are a lot of good points in it that you may want to consider before finalizing your defence.
Edit: You may want to double check re HIP dug-in tanks (i.e. cupolas). I seem to recall that there was some debate as to whether these are able to set up HIP in non-CG scenarios (see V12.6214, sub para c for HIP reference). D9.54 refers back to A9.52 which precludes placement in rubble, and prohibits concealment of any kind. There was a thread dedicated to this subject, but I cannot locate it at the moment.
Found it:
http://www.gamesquad.com/forums/index.php?threads/first-bid-are-the-dug-in-t-34s-hip.128608/
Ignore my point re HIPing Dug-in T-34s; it is prohibited. I could not find the rule reference that permits setting up Dug-in tanks in rubble, which McGrath appears to recommend (p. 36).