Are you renting the easy 8 drum sander from HD for your first and maybe second cut (36-60)? Good little sander for what it is but it’s definitely light (under powered compared to what a pro would use). No biggie, that just means you’ll have to spend a little more time sanding. Or are you trying to do your entire job with the orbital sander? That’s OK too, just tryin to figure out what approach you’re taking. That 3 head orbital sander you linked to isn’t very aggressive either (takes a little longer to remove the same amount of wood) but it does get up close to walls which eliminates a lot of edging if you’re lucky because edging sucks. My buddy did his hardwoods using HD’s square buff orbital sander. Took him a while but it works if you have the time.
Luckily for you it looks like the existing poly finish will sand off fairly easily which means using one of those less aggressive sanders will be able to get the job done just fine. Because they are less aggressive (more forgiving for a DIY) you prolly shouldn’t skip grits. 60-80-100 as opposed to 60-100. If a 60 grit removes the existing finish, great. Then the 80 grit removes the 60 grit swirls and the 100 grit removes the 80 grit swirls. If you jump from 60 to 100, the less aggressive orbital sander might not have enough oomph to remove all the swirls. With a water based satin finish and no stain that might be just fine for a DIY but if you’re gonna use amber seal or anything with any sort of color to it, those swirls will be highlighted by the stain or finish and then it’s too late to do anything about it but wait for the finish to dry and sand it off again so don’t skip grits. I know each sanding disc is 7 or 8 bucks, or whatever they are now, but trying to save time and money by skipping grits will always come back to bite you.