I assume its a wood control panel.
Hopefully you bought the long shaft models.
If so, you can drill a 1" hole for the shaft to go through the middle and then use carriage bolts through to nuts to mount it.
If you get carriage bolts with raised letters, you can easily sand them smooth.
Or if you got short shaft sticks, you can too mount them by cutting out a square for the stick body to fit in and route out the edges to catch the mounting holes.
This way works if you're gonna put graphics and plexi over the panel