What would you do in this spot? Is it a nobrainer get in?

I got suspicious of the flat on the 3 bet, but I had no information on the player and I ended up timing out because I had no time bank, haha.

PokerStars - $4+$4+$0.80|150/300 Ante 30 NL - Holdem - 9 players
Hand converted by PokerTracker 4

UTG: 20.8 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 15)
UTG+1: 39.43 BB (VPIP: 40.00, PFR: 26.67, 3Bet Preflop: 0.00, Hands: 15)
MP: 65.4 BB (VPIP: 20.00, PFR: 20.00, 3Bet Preflop: 0.00, Hands: 15)
MP+1: 62.14 BB (VPIP: 24.19, PFR: 17.07, 3Bet Preflop: 8.00, Hands: 124)
MP+2: 41.89 BB (VPIP: 26.67, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 15)
CO: 84.64 BB
Hero (BTN): 44.57 BB
SB: 14.78 BB (VPIP: 13.33, PFR: 13.33, 3Bet Preflop: 0.00, Hands: 15)
BB: 36.87 BB (VPIP: 26.67, PFR: 13.33, 3Bet Preflop: 0.00, Hands: 15)

9 players post ante of 0.1 BB, SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 2.4 BB) Hero has K A

fold, fold, MP raises to 2.5 BB, MP+1 raises to 6 BB, fold, CO calls 6 BB, fold, fold, fold, MP calls 3.5 BB

it doesn't feels right to fold, right? so if you don't know if you should raise or how much to raise , just call

i like a 4-bet / call here, you are still deep for that, you have blockers to KK/AA and in case you get shoved on, i think you are in decent shape

I'd go all in

I prefer 4-bet ovet a shove cause this maybe will get hands like AQs to 5-bet shove, that may have folded agains our shove