I took delivery of my 3 in February of this year (also multi-coat red) and did something very similar to what you are doing. I did have full front PPF (XPEL) installed the day after I took delivery, and then I drove the car for 3 months until temps warmed up. I did the following DYI:
A friend of mine bought a White Model 3 and I did these same steps for him in July (he bought all the materials and the beer :) Both cars are looking great.
Amazon has the big bottle of M205 for $18