All things that will help to hold the plug in. The only one that will do that AND make the setup look better AND sound better all at the same time is to support the cables on risers. Risers are simple and cheap to make. Mine are MDF shop scrap but you could use wooden dowel with an acrylic base to look real nice. Also the ceramic insulators do not have to be generic white like mine there's a huge variety on eBay all of them with a large screw hole underneath to accept a riser, and the whole thing can be painted any color you, excuse me your wife (the boss) likes.
Speaking of which since it seems this is all up to her why not just put her on? Cut out the middle man, er, party.
Speaking of which since it seems this is all up to her why not just put her on? Cut out the middle man, er, party.