The video basically recommends sandwiching the glass between 2 boards and drill thru everthing to prevent the cracking of the board. I do this with “cuts” as well.
https://www.todayshomeowner.com/video/tip-for-drilling-through-plexiglass/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+danny-lipford+%28Today%27s+Homeowner+with+Danny+Lipford%29