You can only link one OrbusVR account to one store account. Your OrbusVR account contains your characters.
If you just want to get up and running with one copy, I have seen some people say that basically you could login to the same Oculus account on your Quest and Rift, and then since you can create up to two characters on your single OrbusVR account, you could play on both of those characters at once on two different devices with just one copy of the game. So at that point you’re talking one Oculus account, and one OrbusVR account.
If you want your wife to have her own OrbusVR account (so you would get a total of 4 character slots), then you would have to buy another copy of the game, and link it to another separate Oculus or Steam account. Or if you want to have a separate Oculus account on the Rift and the Quest, same thing.