Need a way to hand over control to a tenant or property management company

The Shared User functionality does not allow for changing user codes or adding users. Only the owner account can do that. There are two scenarios here:

1- Long term tenant. We need a way to either hand off the owner account to a long term tenant so the owner can not spy on them and the tenant can control the system.

2- Short term rental managed by a company. We need to be able to add a second account with the same rights as the owner account so it can add and change codes as needed. A Shared User cannot do that.