If anyone uses the safepal app on android/iphone its honestly the best you can use it for mnemonic imports its not only a cold storage app, and when you load up the app all your balances refresh.
No it's not the best app at all.
Safepal app is closed source junk and I wouldn't use it or recommend it to anyone, same as they hardware wallet device.
Has anyone found a wallet that allows multiple mnemonic recovery phrases to be inputted and view all balances at the same time?
I don't see a single good reason why you would do something like this, and I only see security risks.
Nobody in the right mind is going to follow many addresses for bunch of coins from multiple seed phrases, but you can just track address balance, that is simple solution.
If you want to import multiple phrases you can just use multiple wallets, safest thing would be using multiple hardware wallets.