The best way to use them is with a shopsmith. Besides typical motors running a lot faster then you want you also need a squared table to put the work pieces on. In a lot of cases it better to move the disk to the wood rather then the wood to the disk which is why having a quill feed helps so much. Like wise the conical disks wants a tilted table to work from. Then there is dust collection, they sure can add a lot of dust to the air and without some way of catching it...... well you get the idea. And a fence and or miter gauge lets you maintain control for other operations.......
Had you thought about making a shorty out of the shopsmith? That can take up a lot less space then a full size unit and still let you have all the necessary parts to make a system out of it. So perhaps you might see if any shop arrangement might work out that way and shop for another shopsmith?
The other option is to sell the disks and use those funds to help pay for a bench top version sander, as an example of what the lower end buys check this page:https://www.homedepot.com/p/RYOBI-120-V ... lsrc=aw.ds