I run tubeless on my Pinnarello Gravil bike.
There is tape applied to the rim spoke holes on the inside. Then about 100 milliliters of sealant then air it up!
I still carry an extra tube and patch kit just in case because we ride way out in the boonies of Texas on packed gravel roads.
We rode 50 miles yesterday morning and it at the end was close to 100 degrees. I started cramping in both legs with a mile to go!
I had drink 6 bottles of water too!
Make sure you drink electrolytes (Gateraide or mix added to water). As we get older it is even more important. Read a story about a bicyclist that had to be rescued out in the hot boonies as he cramped up and couldn’t ride anymore. He still had water on him to drink!