Advice on bridging 2 different LANs, but have them manage DNS, DHCP, etc independently

I would like to share a resource between 2 different LANs. Network A (192.168.1.1) and a network B (10.0.0.0)

I plan on setting up a ubiquiti wireless point to point link for the connection between the networks (2 sites, about 300ft apart)

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I need both of the networks routers to manage their own DHCP, DNS, etc because they both have their own internet connections, I just need a server shared across both sites.

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Both sites currently running routers flashed with DD-WRT (I know, I know..)

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any advice on the configuration of this? I've been racking my brain and can't nail anything down. Thanks!