I started off with my GPS on said screen crossbar. It's nice having it above the clocks, but then I started reading that some folk were having breakages and Honda refusing warranty claims as they say it isn't designed to take a GPS. Now, most of these breakages seemed to be happening mostly to yanks who were into their off-roading and in all possibility, road riding wouldn't be as severe. But I decided to play safe and change the position to the handlebar clamps. In all honesty, I'd prefer the above clock position, but in reality it's not bad where it is now. It's not like you spend more than a fleeting second looking at the unit, I know I just glance at it when it's giving an instruction and to date, I've not had any pucker moments.
I use the SW-Motech quick release mount attached to the Touratech thingy. I don't like to have the actual mount permanently attached to the bike.