Need advice/ Setting up a mirror in my home gym

Hi everyone :)

I have been working out at home with FB since the lockdown and have been loving it. I am seriously considering giving up my gym membership and sticking to FB in the long term. I have already invested in some home gym essentials like dumbbells and workout bench/stepper.

Now I want to setup a mirror in my home gym. How high/wide should the mirror be such that I can see myself fully when ? I noticed that standard mirrors are 7ft by 4ft. Is this good enough to check my form when I do exercise that require full stretch (is. Overhead press, lateral raise) ?

Edited