I am planning the big flat screen tv mounting arangement, and need to fix a shelf to the wall just under the tv for a few things to sit on, nothing heavy, so want this to be a "floating shelf" i.e no visible fixings.   Searching for brackets the best I have come up with so far is this sort of thing https://www.ebay.co.uk/itm/FLOATING-SHELF-BRACKETS-CONCEALED-HIDDEN-SUPPORT-SCREW-MOUNTING-PLATE-4-SIZES/122922468858?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D52543%26meid%3Db