‎NVMe SSD slot Generation compatibility?

Yes It's backward compatible It'll work as a device even though it would be capable of working in a slot It will work

2 socket on my Z390 motherboard Yes I'm getting a Gen 4 but its for futureproofing, In the near future I'll most definitely have a system

can you own a slot machine Using a Gen 3 PCIe motherboard will enable the user to reach speeds of up to 3400 MBs and 3000 MBs Features NVMe PCIe Gen4 x4 Interface

can i put a slot machine in my business yes because you're using an 11th Gen CPU, you will have Gen 4 speed when you connect a Gen 4 SSD to the first M2 slot