I try to avoid using the term "renting bees".
This implies that if the grower pays the "rent" they are intitled to do whatever they want with or around the hives.
Like let their neighbor or brother in law who "knows something about bees" look around in hives for example.
Or move them around with a tractor after you are gone.
All of this is covered in a good pollination contract that specifies in bold that the hives are nor to be touched or disturbed in any way.
The contract allows for hive inspection at the growers request, having the beekeeper opening and working in the hive at that time.
Just say NO to excuse-izm!
If my bees die, I am responsible.