Yes, you can mount an AIO in that case. The spacing with the optical bays to floor is too tight, not enough clearance for a 240m rad, fans yes, but the reservoirs are too tall. This also puts a 120mm out of the question, since those rads have reservoirs too.
The top fan is too close to the motherboard. Any aio mounted there will run into issues with clearances.
The rear exhaust is different. Normally youd remove the fan , mount the rad to the case. But again, reservoirs are too long, they'll be impeded by the pci ports attached to the case. However, use of a push/pull like a H80i series will work as the fan gives clearance from the pcie ports.
So, you can mount an AIO, it just has to be a 120mm push/pull and performance emphasis will be on the thickest rads possible, the H80i series Corsair.
Which is still too small for any i9.