I got time to check the expansion on my 3" plug. It expands to 3.25" . With a little work it may go to 3.375" that's a big cup holder! I can tell you, if I tighten it in the cup holder, it would likely pull the top off the console removing it.
The Lidoradio looks nice but I use full size commercial radios that weigh 3.5 to 4 lbs. It would be fine if I used a remote kit for the radio. I can't justify almost $300 for the remote cable kit.