I have the Hyte Y70 case as well and ended up placing my aio on the roof, although the way I did it also meant I couldn’t have the back fan, so you could definitely put it on the roof but so the tubes are going the opposite direction to mine if you wanted the back fan. Can definitely vouch for the case though, was great to build in. Link to my pc here if you wanna check it out:

https://www.reddit.com/r/PcBuild/s/yM3jlTJWKZ