eBlocker with Fritzbox and fixed IP addresses

I run the DHCP server at eBlocker 3.2.3. The DHCP server at my Fritzbox 7690 v8.0.2 ist switched off. 

I want to set single-digit fixed IPv4 addresses for the infrastructure devices, i.e. repeaters and LAN access points, and two-digit fixed IPv4 for stationary devices, e.g. TV, PV inverter, AppleTV, Apple HomePods etc. And for all mobile devices the DHCP server should assign the IP addresses from the three digit number range.

As far as I see, I can not assign in the GUI of eBlocker how to specifically assign a fixed IP address to a specific gadget. But in the GUI of the Fritzbox it seems to possible.

Is it the right way to assign the fixed IP addresses in the Fritzbox GUI? Or is an other approach more appropriate?