In other words if you are (1) creating all the keys using the same device and (2) keeping them in the same place and sign the tx using the keys in the same place.... then you are not actually gaining that additional security. It is almost the same as a single-sig security.
That just it, you are giving yourself a fake security, if you create all your keys on one device and store them together. No different from having a regular single signature wallet.
For one to get the benefit of a multisig setup, you should use different devices for each and the should be store separately. But wanting to do this raises a chance of wanting to make mistakes and having to lose your funds cause you will manage multiple seed phrases and also hardware wallet.
But as a beginner starting up you should just stick to a normal single signature wallet and importantly, learning how to back it up safely is a much better choice for now.