Anti-glare Screen Protectors for Outdoor Use (Full Sun)

[GwenButler]

Greetings,
After looking at Internet research results (product descriptions, reviews, etc.), I am not confident about purchasing anything, with regard to Anti-glare Screen Protector solutions.
I am looking for recommendations to better view screen contents on my laptop as well as my dual 18 inch monitors (for karaoke lyrics) when hosting events that are outside in the full sun.

Thanks in advance for any and all feedback.

Best,
Gwen (aka The Karaoke Queen)