Gotcha! It is doable but you will be frustrated with the lack of throat space and most quilts you make will need to be turned half way through because you will run out of room. But the one I linked to may be different. It doesn't appear to have take up rollers on it. Most people (but not all of course!) stick with fairly basic machines to mount on a rack. Often one that does straight stitch only. You don't need any fancy stitches to do FMQ.
You may wish to also look into a suspension system if that is feasible for you. We had one member here build one and post pics of it.
PVC Embroidery/Quilt support frame
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