I would direct you to this forum to post your questions.
https://dashcamtalk.com/ Lot's of folks very knowledgeable in this area.
A couple things to be aware of is these are usually either Lithium battery or Super Capacitor. I believe Super Capacitor wins out as they're not as prone to fail due to heat.
Another is dual cams consume twice the memory of a single Dash Cam if recording at the same fps & resolution. Small capacity cards will fill faster so the amount of video you can keep will be limited with loop overwrite on devices that only allow small memory cards.
The processor & sensor used is an important factor and contribute much to the clarity of the video captured. I didn't see what brand sensor was used in the link you listed so not sure they use a quality sensor or not. I assume at the price point probably not.
Try the link I listed and read the threads thoroughly. There are a few shills out there so be thorough in your research.