What about wall shelves above your change table? The ones with brackets are pretty cheap. Until recently I too changed on the floor but due to surgery & bending like that hurts until I recuperate I've repurposed an old (short) dresser into a change table, with a large folded towel on top that they lay on (a tall ikea stool helps as they can climb up themselves)...the youngest kids cannot open the dresser drawer. I have a picture of it in my albums (daycare set up) to give you a visual (stackable shelves from the dollar store hold my diapers on the counter beside it).