RAM® Twist-Lock™ トリプル吸盤ベース（ボール付き）

I was a bit skeptical about suction cup mounts, but this triple base setup has held my tablet securely on my boat dash through choppy water and rough corners. The 1.5" ball gives plenty of adjustment range without slipping.

The 1.5" ball on this base locks into place with zero wobble, and the triple suction cups grab so tight I had to peel them off one at a time to reposition. Mounted it on my boat's fiberglass console and it's held through two rough lake days without slipping an inch.

Put these on the glass of my office whiteboard to hold a small monitor, and they haven't slipped a millimeter in two weeks. The 1.5-inch ball mount is surprisingly versatile for different angles. Solid hold for the price.