With regards to the power supply I would double what the fans need. Minimum of 320 watts. Each fan is 80watts. So two fans 160 watt. I don’t think there is a great difference in prices for different power supply ratings either.
I would add pre filters for sure, even just a cut up felt dust extraction bag attached to the front would work well. It’s difficult to clean this type of filter so having a flat surface to vacuum now and then would extended the life of the filters.