Hi Barry
We have done a lot of testing about where best to position the wiimote and our results show that about 3m back from the projected image and slightly to the side (approx 1m from centre of image), gives the most reliable results. For right handed people the best offset is to the left and obviously vice versa for lefties although this is not crucial. We have also determined that the optimum projected image size is between 1.2 and 1.5m - anything bigger requires the wiimote to be too far back and will give unreliable performance.
Height from the ceiling is best either in line with the top edge of the projected image or up to 500mm above it. The mounts we are going to supply may be a little large (depending on where in the world you are) to post at a reasonable cost, so we are looking at creating a kit solution that people can add their own 'pole' to and create mounts of any size.
Dave
www.3pinteract.co.nz