Meraki needs an antenna like the AIR-ANT2566P4W-R=, which is the best antenna for deployment between racks in warehouse/distribution centers. Nothing they offer has the same RF pattern. The closest they come to is a square directional antenna, MA-ANT-3-F5/6, which is sub-par for the use-case. Seeing as this is a Cisco antenna, at the very least Meraki should certify it for use with the MR4E/52E. I have a customer who is itching to switch over to Meraki in all their global distribution centers, but the only solution I can come up with to meet their needs would require them using the P4W, even as unsupported.