Question about fabric network connection

[bh4rtp2023]

For a multiple hosts deployment scenario, one host for ordererorg, the second for org1 and the third for org2, I can guarantee the connectivity between client and peer, peer and orderer. Need I configure the anchor peer connection between peer0.org1 and peer0.org2? Is there any advantage of such three subnets over a single network?
Thanks a lot.