SB is 42/15/1.0 over 48 hands, MP2 is 25/2/2.3 over the same number of hands.

Apologies if this is super standard. What is the right amount to bet on this flop? Should I give a free card instead and hope that one of them bets the turn?

PokerStars No-Limit Hold'em, $0.25 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($28.45)
UTG ($13.85)
UTG+1 ($4.70)
MP1 ($56.25)
MP2 ($21.20)
CO ($23.30)
Hero ($32.90)
SB ($27.85)

Preflop: Hero is Button with K, K.
2 folds, MP1 calls $0.25, MP2 calls $0.25, 1 fold, Hero raises to $1.5, SB calls $1.40, 1 fold, MP1 folds, MP2 calls $1.25.

Flop: ($5) 8, T, 6 (3 players)
SB checks, MP2 checks, Hero bets $4