1- Actually, Yes, it is possible and you can do it. Let me explain to you.
When you edit a product from the product options on the edit product page you will see the option for the countdown as you can see in this image: https://prnt.sc/vq1Ghu9hEzxR
By doing this you can set the countdown on simple products only.
For the Variable Products: The creation of the countdown for every product variation will slow down the product page a lot. That’s why we did not add that.
You can add the countdown shortcode in the short product description https://prnt.sc/LXbHV_rkmEIA
[countdown type="type2" scheme="dark" year="2023" month="Mar" day="10" hour="3" minute="01"]
2- Sorry to say, we cannot suggest any third-party plugins to our customers because sometimes they conflict and cause unexpected issues on the site.
I hope you understand.
Regards 8Themes Team.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.