That should be enough filter for the job.
As far as pads go, I think the plastic pads are OK. Even if you use a plastic pad, the base below it should be well leveled and properly supported. Perhaps level soil then several inches of class 5 or class 2 gravel that packed down as well and then placing the plastic pad on that, maybe putting edging and decorative rock around for water dispersion and appearance. Ideally, a concrete pad is best. Large enough to support all the equipment and possibly even using anchors to fix the pump in place.
I'm far from a pump expert but it is large enough for your pool and looks to be pretty efficient. My 1 HP single speed pump and 350 lb filter are enough for my pool which is nearly twice the volume. I would have gone for an even larger filter when mine needed to be replaced but it would not fit on the pad between existing equipment.
As far as pads go, I think the plastic pads are OK. Even if you use a plastic pad, the base below it should be well leveled and properly supported. Perhaps level soil then several inches of class 5 or class 2 gravel that packed down as well and then placing the plastic pad on that, maybe putting edging and decorative rock around for water dispersion and appearance. Ideally, a concrete pad is best. Large enough to support all the equipment and possibly even using anchors to fix the pump in place.
I'm far from a pump expert but it is large enough for your pool and looks to be pretty efficient. My 1 HP single speed pump and 350 lb filter are enough for my pool which is nearly twice the volume. I would have gone for an even larger filter when mine needed to be replaced but it would not fit on the pad between existing equipment.