I would recommend to place the 88 in the back lines not at the front because of it's great range. So if you want to cover a VP place a MG bunker near it. The 88 should be behind the bunker so that it's "unreachable" for enemy infantry and make sure to place a MG team inside the bunker. So that it can cover the 88 crew in case of a airborne attack.
I think the first propaganda effect should be a little bit more expensive but while it's active all crews (only pak38 & 88) get elite armour.
@ZerstI would truly like you to link those replays so I can see for myself. I don't believe 88s are a valid investment except in team games, where even then they're easily countered and stolen. Flakvierlings do awesome damage but again are countered too easily because of the low crew survivability. Emplacements tend to have less use in competitive games because it's all about mobility and maneuvering to the VPs. A flakvierling guarding a VP can just as easily be turned against you.
Not to get off-into-history discussions, but I want to make a quick point:Yes the Flak88 was originally designed as a AA weapon. General Rommel of the Afrika Korps was actually one of the first to command his troops to use the Flak88 as a AT weapon, due to his lack of supplies and limited US Airborne in Africa he had quite a stockpile of Flak88s and their ammunition.
There where a couple of others but couldn't find them atm- sztefenfu playing really defensively
Just played a Scheldt game.