Using radiofrequency for mole removal is generally safe and effective. It's a non-invasive method that uses heat to remove the moles, which can be less painful and have a quicker recovery time compared to traditional methods.
As for having multiple moles removed in one session, it's usually fine. Many people do it when they have several they want to get rid of at once.
Regarding sun exposure, yes, it's important to be cautious. After mole removal, your skin can be more sensitive. Make sure to use a high SPF sunscreen and avoid direct sun exposure to prevent sunspots and other pigmentation issues.
Hope this helps