the suggested way of doing it is to use salt cubes. they recommended salt cubes with holes in them.( i have no idea where to get something like that) and to run a wire thru a bunch of them to keep them from being carried off. Purdue also mentioned taking a five gallon bucket and cutting it in half length ways. use something to keep the salt off the ground and put the cut bucket on top of it. this keeps the salt from getting wet and melting into the ground. the ideal situation would suspend the salt off the ground , have a cover to keep the rain from melting it, and be protected from the deer.adding salt to the habitat definately increases the carrying capacity of the area , and can easily be accomplished by anyone. This is a lot older than 8 years but you may try and go to do a Purdue University search. I just copied this and pasted to give you more information.
poking a small hole in the top for a peice of wire to suspend it on would work great. a T hanging on a chain (like a tape holder) would make stacking several, and future servicing super easy too.
of course its metal so the salt will eat it up eventually, but you should be able to get several seasons out of it, and i cant imagine making something like that would cost more than a buck or two.
or you could suspend them on something like this as well
10 pack is $10 on amazon
https://www.amazon.com/dp/B07VF61LB1/