So I used small neodymium magnets and a stainless steel toothbrush holder as the main base support. I bought the toothbrush holder sometime ago but it was useless as modern toothbrushes won't fit in the slot. I've kept it because I love the craftsmanship and didn't expect I'd use it for my guitar. You can also use 2 drawer glide guide if you can't find a similar item.
You will need
- D10x2mm magnets (which can hold 2kg each)
- square fastener
- cellphone skin or protective film
- stainless steel toothbrush holder or drawer rail guide
Putting it together is not too complicated.
You can opt to glue the magnets on to the back metal plate of the guitar or on the fastener only - I prefer this method so I can grab the guitar and use it without any magnets or extra hook that might catch my belt or anything.
*** update 3Nov ***
Found a cool alternative to the toothbrush holder :) - stainless steel glass holder. It comes in different sizes. I got the 12x40mm for my violin project but the length is just right for the electric guitar also. Just replace the standard screw with a much bigger and longer one for concrete or wood surface.