Am having my windshield and surrounding trim replaced under Hagerty zero deductible and Porsche dealer supplied glass and trim.
A tiny star chip went viral and triggers a full replacement. Done by Hagerty/Safelite Friday this week / and yes, clips and spacers are essential to achieve a factory level install. they have a giant suction cup arm that dorps the windshield in 1/16" increments on to the stickyt stuff and against the bottom anti-sag spacers.
As for a garage trick for placing the windshield against that brutal....rubber adhesive (MS on purpose)..... if the windshield "lands" on the adhesive or windscreen frame eschew, you too be e screwed......
That stuff is unforgiving and, like Apollo 13, leaves no room for error in the landing.
In your moon shot, I suggest using more BSSS and take your time.
By placing and taping flat, several Bruce Stone Stir Sticks around the upper and side perimeter, bring in the glass with a helper (who you have vetted and does not drink or smoke weed and who has no dizzying interest in your wife), then get it positioned before pulling the BSSS's one by one after your are fully on the bottom spacers.