I will not advice for someone to have two bitcoin wallets on the same PC. Mistakes arise out of complications and it can be complicated when you have more than one wallet on a PC.
Its is not allowed to make multiple. Account
What?
There is nobody stopping you from making as many wallets as you want. Sure, if you want to use centralised, insecure online wallet, you'll have to follow their rules, but if you make desktop wallets, there is no limit, unless it's a technical limit built into your wallet of choice. In this case, you can always change to a wallet software that doesn't have these limit in place.