Exodus is a pretty good wallet for this purpose, and so is jaxx, although i heard jaxx had some security issues lately?
2, yes. but depending on your wallet, it could sometimes take a while to be updated again, since you need to update/ download/ sync with the blockchain of that altcoin.
Exodus does seem to be a good wallet even though it's the only one I've used. The problem is that it only supports 10 different coins at this time. I wish there was one wallet that could hold everything, but I'm sure that's too complicated.
Thank you!