I use the twist lock mount and stick it to the piece of windhsield that is next to the panel to my left. Depending on position, it could obstruct the ASI but it really hasn't bothered me. Just lean slightly to see it or reposition the mount. I love it though.
Long Arm - There is also a short arm.
Tablet holder - I find that this holds way better than I was expecting it to. I often take the entire assembly with me to golf courses. I mount the setup to the front windshield of a golf cart. With all the bouncing around you experience driving a golf cart around I have never had the tablet fall out or have had the suction mount come off. Pretty impressive. That's just me though.
Also, I mainly use this for IFR only. For VFR I just keep the tablet in my lap because I only reference it when I need to. In IFR I like to have the information right in front of me without having to look away.