I have one mounted to the LH rear on a Frontrunner antenna plate mounted on my Frontrunner roof rack. The antenna plate folds down along the rack when not in use. I mounted my weboost next to the rear AC panel and utilizes the factory rear cigarette outlet. The interior antenna mounted (double-sided sticker) on the LH C pillar between 2nd and 3rd row.
Here's the gotcha with the weboost. It draws a lot of power and heats up pretty quickly. It's not as small as the pictures on the box, it's the size of a dc-dc charger. The interior antenna is technically omnidirectional, but works best if you're directly in front of it. The further away you're from the antenna, the dB drops significantly. With that said, I can place my mifi in the 3rd row cup holder and connect my devices via wifi for internet. From no signal, I can sometimes get 1 bar, it's a bit or miss. I'm definitely glad to have it when I needed it.
Here's a pic of it folded down, when not in use.