One DHCP Server, Multiple Subnets??

[Quasaur]

Technicolor modem
Netgate 1100
Linksys E7350 Wireless Router

I'm NOT using the Internet port on the Linksys to connect to the Netgate

Netgate is the only DHCP Server (x.x.10.0)

Most devices are wireless or wireless & Ethernet.

QUESTION: What's stopping me from ASSIGNING MAC ADDRESSES TO MULTIPLE SUBNETS (x.x.20.0, x.x.30.0, x.x.40.0) under the one DHCP server???
One subnet for the backbone (x.x.10.0 for Netgate, Linksys, Netgear Extender & management console)...

One subnet for the TVs & XBox (x.x.20.0)...

One Subnet for mobile phones & tablets (x.x.20.0)...

..and guests still get the default range (x.x.10.100 - x.x.10.199)!

All addreses are assigned statically under the one DHCP server on the Netgate, each subnet can be assigned an alias & I can build firewall rules &/or static routes (even traffic shaping) to control traffic between the subnets.

Anything wrong with this picture?

Thanks for your time and attention!

[netblues]

@quasaur So you mean having a single supernet broadcast domain with e.g /22 mask and have many / 24 "subnets" with a /22 mask and single gateway?
If yes, it can be done, BUT the issue would be tha you need to manage all mac addresses manually.
It can be done but it is very cumbersome, especially in the long run.
You are better off segmenting your lans with vlans and use single dhcp on pf to manage them all.
You cant have rules between them as long as they are on the same physical interface too