An actual PSA: Your first placement
It seems an astounding number of people just refuse to read updates. So to clarify: Your first placement game will decide the worst possible rank you could get after your 8 placements. So it can and likely will go up from there during that time, especially because you can't lose LP during those matches.
More importantly, you gain boosted LP during your placements, and can't lose any. So you should try even harder than usual, not refrain from trying.