One improvement I could suggest, if equipment locations permit, would be to connect the 12 port switch straight to the 48 rather than via the 24.
I run a Modem, which connects direct to the router, the router then feeds a single link to a 24 port managed switch which itself is connected to 3 WAPs which also have 4 port switch capability too. The router works fine - just handing traffic to and from te outside world and providing teh DHCP server capability.
M H C
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