Add tiny magnets to attachments and then store your attachments anywhere you have a thin sheet of metal on a wall. No need for any plastic attachment holder.
Half inch round disc magnets work great and look elegant (if you see them at all).
Amazon charges $10.88 for 20. Screws are extra (need tiny 1/2” long wood screws). Attach about 1.5” down from connecting end of attachment so does not interfere with connecting with vacuum.
Then get any thin sheet metal (hardware store perforated steel sheets work great … maybe 1/8” thick plates used for construction).