iPhone 6s repair and glass screen protector instalment

Hi,

I requested a screen repair for my iPhone 6s. Due to the pandemic, I will have to mail my phone in order to get it repaired. I already placed the order for the screen repair and I will receive the shipping box in a few days.

My request is that I would also like a glass screen protector installed on my iPhone right after the screen is repaired. How should I proceed?

Thank you :)