decent spot, yes

Depends a bit on what you expect BB to do and on how you think his range looks like. Is he going to coldcall a hand like 99, TT and then fold against your 4bet? Is he going to continue and overfold PF?

I think this can be a good play but you will neeed a battle plan ready on how to deal with it postflop.

Against BU, obviously you can expand your 4betting range. When he jams, its an easy fold.

CO has good stats to 4bet against and your hand is fine for it
I agree w Euro it depends on how BB is playing here will he call TT and then go with it or let it go ?

You look decently strong but there will also be a bit of deadmoney in the pot which BB might find enough to stack certain hands

Seems like a good candidate. QQ+, AK, KQo and A5s puts you at about 3.7 % IIRC. We can be more selective with 4 bet "bluffs" here since there are 2 players to act behind vs the standard 4 bets spots where we are only playing against the 3 bettor preflop.