Recently we've discovered tROAS type of campaign is available on our ad account. We wanted to test it, but we couldn't find out there any information regarding conversion window tROAS is optimizing for, so we don't know how to start
For example, on Facebook Value campaigns we can choose either 1day or 7day conversion window, and we set minROAS accordingly to what we need to recoup in D1 (for us its approx 5%) or D7 (29%).
Do you have any experience with UAC tROAS? Is it better to start with higher tROAS and decrease it if we get no impressions or vice versa start low and increase tROAS to the point where we get the best results on reasonable scale?