5-10 PLO 9 handed $1200 effective

mid open limps, cutoff raises to $40, Hero on the btn flats with Ac 5c Kh Qh (I know I could 3-bet but flatting must be 'ok') blinds call 5 way

Pot $200 5 way $1200 effective
Flop: Tc 9c 2d Giving the btn a nut fd plus top gutshot

checked to the btn... What should the btn do?
A)Bet. If so how much?
B)Check back

I am new to PLO, but not poker. I'm trying to understand the theory of how I should build my betting range here. I'm pretty sure if I have a naked nut flush draw I should check back the flop is that right? But If I check back a naked nut fd and I check this hand back also aren't I limiting my betting range to made hands and stabs (that I am bet/folding). I could have a nut fd+twopair/set or nut fd +openender/wrap but its pretty hard to flop those. In general what parts of my range should I bet/fold vs bet/call vs bet/getin vs check back?

In the actual hand I bet $160 and my plan if check raised full pot was to ship my stack and race it off. Not that its a fist pump to get my stack in. I'm a 2-1 dog to a set, but flipping against top two or a wrap+fd. This got me thinking after the hand what if I was $2500 deep now if I bet and get check raised full pot I have 3 options I don't like

1)bet/call getting 2-1 on the money but being a 3.1-1 dog to improve on the next card. I have implied odds, for sure, but maybe not enough to make this a good spot
2)bet/fold 11 outs to the nuts and all the equity it has. I hate that
3)bet/3bet and get my $2500 stack in: That seems suicidal!

So because I don't like these 3 options does that mean I should check the flop back? Also by checking I get to realize my equity and sometimes trap my opponents who might make a weaker flush on the turn, but would have folded on the flop if I bet because they are out of position and could be drawing dead.

Thanks in advance!