When we have dual radio nodes we can create a mesh in the following way.
Use the 5G radio for the ad-hoc connection with the neighbor nodes.
Use the 2.4G radio for the SSIDs to which clients will connect.
Make sure each node's 2.4G radio is on a non-overlapping channel (1,6,11) to reduce interference.
Test shown that this configuration results in an increase of the throughput of nearly 3 times when compared to a mesh that consist of single radio nodes.
See the following diagram for an overview.