You could use an ice cream tub or a plastic photographic tray. You don't want to drill through into a table or something like that.  Put a bit of newspaper at the bottom of the container. This will prevent you from drilling a hole through the container itself. Another option is to place the glass on an extremely flat surface where it is completely supported. If you can, put a rubber pad or other firm, cushioning material underneath it, but the glass must be flat and supported. In other words, don't hold the glass up as you drill or something like that. At all times be cautious about safety. Make sure that you aren't drilling in an area where you could damage something, and you want to make sure that power tool cords are not near water. This will help prevent the bit from slipping as you start drilling. You could use cereal box cardboard for this purpose.  Another approach is to tape the inside and outside of the glass you will be drilling with packaging tape or painter’s tape This will stop the glass from splintering. Tear off two pieces of the tape. Place the pieces on the glass in an X pattern over the spot where you want to drill a hole. Never drill within 3/4" of any edges. Make a reference mark on the tape on the spot where you want to drill the hole. This will help guide you as you get ready to drill.
ضع الزجاج في وعاء مناسب له. ألصق قطعة من الكرتون الثقيل أو الشريط اللاصق على الزجاج.