Is it safe to manage multiple bitcoin wallets from one pc?
As long your PC are secure enough to saving multiple wallets, i think it will be safe.
If you want to have multiple wallets in PC, you must have more backup so your wallets are really safe in case your PC is broken.
If you have your own PC and you can save all your important files from there then there will be no problem on storing multiple wallets in your PC. I don't see any problem of managing multiple wallets, but in my own experience I just have one BTC wallet and one ETH wallet, I don't really use multiple wallets because of I don't want to get confused with two different wallets.