One of those situations where you can't do much else i believe...

I dont think that in such a multiway pot you should slowplay top pair and top kicker if there is 3 players more. I would raise the flop and try to get it right there because if u check and all other players check then u let others see a free card and turn their weak hand on the flop to a good or strong hand on the turn or maybe make some draw. If u would raise the flop then its a big chance that villain would folded his third pair - 77 and you would get the chips.
I agree with villijmeen99, you should be betting the flop, that is one of the best flops to have for you, but the turn can bring some very bad cards for you. In a multiway pot try betting big, like in this situation i would bet around 8 to 9bbs and call and all in
This is a clear value bet on the flop multi way. The change someone will bet isn’t too high on a dry board like this. I expect the plan was to check/raise and that’s risky as well. Then you will isolate yourself against better like sets etc. If someone will raise after your Cbet you should even consider folding. So many weaker hands aren’t going to raise in a multi way pot as well. That’s the same for the turn I think.
Cheers,
SDK1987