Iam a nit ?? PLO10

you have 36% equity against a made str and top set...
Probably i would fold as well but i think you have good equity for 100BB

Reason for calling: Hoping CO calls as well. There is no reason to be raising this flop when you're not closing the action as you want it 3 way rather than heads up.

Reason for folding: It's a marginal play and you're out of position so unlikely to get paid off if you hit since it would be super obvious what you have calling 2 bets cold on the flop. With this in mind, it's probably fine to fold here, however in position a call would be great.

The additional couple of outs you have from 9's hitting makes a big difference as well, but being out of position here is just enough to warrant folding. If you were absolutely certain neither opponent is folding this flop then shoving is okay, but we all know that can never happen.

So I this is a close spot and folding can't be to wrong??

When I am in spot where I have nut FD and I can go for 3 way all in , I should usuallydo that??

yes

The money already in the pot means it is +EV