While that works, I personally would avoid doing that unless you really need the channels now. Due to limitations with the firmware on the active hub that were never fixed, IIRC, you are restricted to the first 512 PixelNet channels for DMX use. If you start your PixelNet channels right after your known DMX and then want to add another DMX device such as a fogger or another LE, you would need to renumber your entire show to fit it in. If you are positive that you will not be adding any further DMX or are tight on PixelNet channels, then it makes sense to start the PixelNet channel numbering as soon as possible.