I believe in the "You don't get anything for nothing" saying so I avoid free security products and choose from the best paid-for products. Reviewers regularly recommend their "Top 10" products so search online but I find that Norton Security (one of the top products) does the job silently in the background and does not bother you with pop-ups. For around £20 per year why bother with the hassle of free products? Surely getting rid of their pop-ups and adverts must be worth £20/year and know that you have a top-of-the-range product?
Xiaomi Mi 8 Review