Stay away from STAPLES!!
If any of those YouTube videos suggest using staples, do yourself a favor and either 1) follow Glen's technique, or better yet, 2) hire a table mechanic that knows how to use Glen's technique that uses glue.
I've personally seen Glen install cloth on my table using only glue. I've installed cloth 3x myself using staples only, and I had John Burns, aka "scruffy", install my cloth previously using both staples and glue, and there is no way using staples will produce a tighter cloth install on slate than Glen's technique. John Burns is now using this technique for his installs.
Bottom line, hire a pro that knows how to do it right. You will not be disappointed. You've spent $250+ on Simonis cloth, make sure you get your money's worth and have it installed the best possible way.