For the lifeguard stand walkie mount, I recommend going with a durable and secure option like the RAM Mounts Universal X-Grip Holder for 2-inch pipes. This mount has a water vent hole to prevent any water damage to your device and can easily be attached with two zip ties and a small amount of double-stick tape on the back for added security.

To make it even more secure, you can add holes to the mount where the zip ties can thread through and wrap around the pipe of the lifeguard stand. This will ensure that the mount is securely attached to the stand and won't move or shift during use. Overall, this choice will provide a reliable and sturdy option for mounting your walkie talkie on the lifeguard stand.