Which suite is suitable?

Which suite is suitable?

Hello,
I am searching for an asset management tool and somehow MDM includes asset management.
My general conditions:
- up till 100 devices
- 60 laptops (Mac/Lenovo Linux)
- 20 smartphones (Android/iOS)

My questions:
1.)  Which suite is suitable for us?
2.) Are devices which are not at use at the moment also countable as 1 device in the price matrix?
3.) If yes in 2.) so do I need separated Asset Management Tool und MDM? What is the best practice?

Thanks for your help.