Hand 1 is not a good play imo. Tight V will potentially bet it himself, you block a lot of the hands you want to call. In a multi-way situation your play of blowing up the pot is poor as well imo.
Hand 2 a donk is actually good because the original raiser will often not cbet this type of board, lots of hands can call your bet, you can get raised by worse hands
.
Usually when I'm donked into I slam the door on them. Most often it is a weak-top pair type of hand on a dry board. Something like A9 on a 954 rainbow type of flop. In position you can usually just blow V's off of their hand if you have 2 overs. If you raise them on the flop and they come over the top, just fold it. It's called a donk bet for a reason, there are times to do it, but usually it is a poor play.