In an RF design the most expensive part is to run the cables and mount the APs. Also its quite costly to re-position or relocate AP’s so its very important we get this one right.
AP placement would also be the key for you to meet your design requirements, getting close to users is one of the keys to success for your WiFi.
While working on lot of retail space with high ceiling it not very uncommon to see AP mounted close to duct work which would cause a huge about or interference and the performance will suffer quite a lot.
Both these above installs will easily qualify for Bad-Fi
Another one would be to see the AP’s mounted on the walls, again looking at the antenna pattern for these AP’s its like a donut so they should be mounted on the ceiling to get more coverage horizontally and not vertically.
Again same is true for these two installs, they qualify as Bad-Fi
Some of these retail stores have very high ceiling upto 25 feet, but all the product is under 6-8 Feet. Another school of thought is to try and use Directional antennas but will try and explore it next time. I have used them in warehouses but never tries them in a retail stores.
In these same retail stores I see cameras and lights hung by drop poles, then why not the access points. Lot of times the reasons I hear was we checked the signal was coming. Well yes signal might reach you but more important things to check are what data rates are your getting, SNR , retries, such factors make the Wi-Fi good or bad. If your Wi-Fi does perform bad due to these reasons you can try your best to tweak setting on your controller it would help much and AP placement is foundation of your RF design.
Below are some installs I have done with drop poles and we have had great success. First one was custom solution using Aruba W2 brackets with Electrical box and 1 inch pipe to run cables. Here ceiling was not that high but was concrete ceiling
This one was using Oberon_Model_900-HC
Would love to see what others have been using for tackling high ceilings.