This is a really great hand because of the highly unusual dynamics going on.
You have a TAG in CO who folds to 3-bets an exploitably high amount. As an adjustment, we're flatting QQ on the BTN. SB is squeezy and likely has the same read as you on CO. So you have someone who folds too much and call on the button; we print money by 3-betting ATC.
I don't hate flatting and I don't mind seeing a flop 3 ways but there are a lot of things to consider:
The pot is very large and we run the risk of getting bluffed off our hand is very high. Having position in this spot is actually not that advantageous because of the SPRs. I realize this is 4NL but the SB likes to attack dead money by his squeeze stats. Since we (as in us and CO) should reshove our best high-card hands like AK/AQ he can profitably bluff A-high/K-high boards because it's tough for us to have much there. Also there are plenty of times when he'll have K4ss and shove on a ATxss flop and we fold.
Also, it's not quite to the level of "my tournament life" or "flipping at best" but the phrase "what worse calls?" annoys me. I'm all for manipulating calling ranges but this is absurd on its face because we have Q freaking Q. Not only do we have QQ, we are probably way above our perceived hand strength so villains can and should snap with much worse. If you're not willing to attack huge pots with worse hands than QQ in spots this profitable you are going to have a tough time playing 6-max.
As noted we have odds
to get it in even if his range is only QQ+/AK.
Finally, when we have the right equity and the pot's huge I'd rather just realize my equity and let the other guy figure out how he wants to give me money.