Many hotel room beds thoughtlessly lack attachment points for… well, whatever you might want attachment points for. The solution, though can be as close as the closet.
If your room has a full-size ironing board, take it out and flip it on its top. The legs spread to a variety of useful widths – fasten a pair of wrist cuffs around the table legs and voilà! Attachment points. Add a piece of luggage to hold the board down, and proceed with your villainy!