You can play it in two ways. You can raise it otf to punish your opponents right away or wait for a safe turn card and c/r it all-in ott.
Wp.

What do you think of donk bet flop?

I think donking the flop is clearly best. Since the flop is three-way and the board is wet, it's not very likely that one of the opponents will bet light. What this means is that if someone bets their range is going to be decently strong, or that it will get checked through. The latter would be a disaster. Unless the flop is HU and/or the board is somewhat dry - and thus the likelihood of the pre-flop raiser making a c-bet being high - I would default to leading the top of my range (and some hands that aren't good enough to c/c but too strong to c/f). In this case for value, for protection, and to build the pot, and as part of a general donk-betting strategy to keep your own range uncapped and to define your opponent's range as well.

Furthermore, also in terms of multi-street planning I think donking trumps c/r. Now you c/r and give away that you're strong, while you leave SPR ~1 on a board that's likely to create another nuts on the turn, leaving you to play a guessing game from OOP. All this allows your opponent to play perfectly against you. By leading the flop though you can either get the money in if raised (which is preferable when OOP anyway), or leave a much better/less awkward turn scenario for yourself when called.

What hands raise your donk ip when you donk into 2 people? Only 99 you crush but you stack it anyway. The rest are combohands that are flipping against you. I prefer a c/r but what you say makes sense too. I might delay my c/r to the turn w 99/33/q9 but not topset. You hate to loose action on board changing card vs q9+.

I think you leading far too many strong hands so you end having up a very weak continuing range vs his C-bets and no xr range which puts Villian in a very nice position where he could bet quite wide (not that this matter much on PLO25 tho). You will see either UTG or MP bet with a frequency of around 50% which is not that low(or is it?). Also donking here OOP in 2 makes it easy for them to play against you, you almost never get raised, they might even fold hands they would have bet with.
Not saying you should not donk here QQ at all but wanna you have some very stong hands that you check here and you have to have xr range here. I would actually prefer donking this combo compared to sth like QQ76 because you block overpairs and combo draws UTG will C-bet.

I like the flop check raise.
I think it's better to bet the turn than to check-fold. You have about 22% equity even vs a made flush or strait, and if he has the strait he won't be able to call easily and might even struggle calling with a non nut flush, and you're getting about 2.8:1 pot odds on your turn bet even if he does call, so you're not losing a ton of money even if he has a nut flush 100% of the time, which he does not. I guess you could give him some kind or range and run EV calcs with what % he folds, what % he calls, and what % you win when he calls with his calling range. He would only need to fold to your turn bet a small percentage of the time to make it profitable, like maybe 7% or more villain folds = +EV turn bet? The problem I see with check fold turn is he's bluffing sometimes.