Just bought a new CX5 and looking for mats. Are there any custom mats that don't cover the hump in the back?

 

Yes.
Though I have no idea why you wouldn't want to protect the hump carpet.
Just do a simple Internet search for rear floor mats for "insert your year here" Mazda XC-5 and you'll find literally hundreds of them.

 

Weathertech make top quality mats.

OutdoorMat – Stop Messes at Your Door | WeatherTech

 

Direct link to WT CX-5 mats with no rear center section. Curious as to why you wouldn't want the one piece rear mat as if you have a person in the center you won't have any protection on the carpet on the hump

https://www.weathertech.com/mazda/20...s-all-weather/


This is what I use :https://www.oedro.com/oedro-floor-ma...ull-set-liners

They are only $85 shipped with the current discount code. The mats have been awesome for the 4yrs I have had them.

 

The OEM mats from Mazda are really good. BAM Wholesale Parts has them for great prices.