For the odd items that I have attached to my board (Silver 9000pro) I have used Blu tack. Don't know if you have that in the USA (it is like plasticine but cleaner and more adhesive).

Obviously it won't hold anything too heavy (Scott's mirror should be fine tho ) but the odd sheet of music etc is no problem. Comes off clean as a whistle as well.

If I have unplugged any cables from the back for any reason I usually stick them to the top of the board with a blob of blu tack so they don't drop down the back (saving my back in the process )Then I can just plug them back in when I am ready!

Tony (tip number 24 in a series of 432 )