Just wanted to update this for those who responded and were interested. Despite the complexity I ended doing three surveys and gave them three options: The first focused solely on supporting their legacy 2.4GHz scanners and containing the RF in pick modules via severely reduced TxPower in the pick modules. I have MR53Es with the A-series dipoles salt and peppered overhead on each level. Even at 1 mW there will be areas of Channel Overlap. It simply cannot be avoided. The second option was similar to the first, but was also designed to provide near VoIP grade 5GHz throughout, including the pick modules. For the pick modules I am used Meraki's F-Series Narrow-Beam Patch Antennas at the ends of the rows at the top (9') with a ~5 degree down-tilt. I was able to stagger them zigzag style on each level. It is about 1 every other row. Surprisingly the model shows them providing great coverage with very little bleed between levels, even for 2.4GHz - so long as I keep 2.4GHz to around 4mW. The rub is these antennas MSRP at $1,400 and they will need about 70 to cover all four levels. I am not holding the purse, but I had sticker shock! The third focused only on 5GHz, which meant I had plenty of non-overlapping channels for the the pick-module and could use the E-Series Wide Patches to cover the pick modules. They still needed a fair amount, about 60 for the area, but at almost 1/4 the cost, I wanted to show them the savings of upgrading or replacing their legacy scanners. In the end, they didn't even hesitate to jump for Option 2. I guess I should be happy with it, but who really knows if this will shake out as expected once the warehouse is built and these things are deployed. Something tells me I will not only have to make more post install tweaks and optimizations than normal, I am going to have to be present to assist the cable vendor figure out how they are getting the almost 2'x2' F-Series antennas where they are needed. Anyways, thank everyone for chiming in on this, I used everyone's advice for this project!
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