My recommendation is also to get some bed risers for your table... this will help your back alot!! Also using masking tape to hold your quilt in position... smooth using yardstick .... I understand the floor situation more than you know !!
If this does not work... think outside the box... VFW, Community centers, school lunchrooms and libraries love quilters and do not mind us using their tables...always ask first you would be surprised how much people love watching us work on our quilts..
hugs
quiltimama