What's the best way to structure ad campaigns on Google? Just create a pmax at target CPA? Split up the pmax and have a separate video and search campaign?

A lot of my campaigns, mainly PMAX, like bidding for extremely cheap traffic, often getting $1-$3 CPM. I'm bidding for customers in the US, so I'm confused why it's so cheap. The CPA is kinda ok, but it fluctuates a lot. Is this CPM too low, and if so, what should i change to increase it?

Has anyone used a CMP partner for Google consent mode? I was looking to set it up but the first option was like $60, or higher if you get a lot of traffic, which I do. Does anyone have a free or cheap way to set up the consent banner, or an easy way to set it up manually without a CMP parnter?

I'm no stranger to inconsistencies in the results from ad platforms, however arpil and may have been very strange for me. Compared to Jan-March, the cost per click has been higher, while the conversion rate is significantly lower. The main KPI on the funnel side is the sales page CTR which went from like 25% down to 15%. I've launched new campaigns and audiences, refreshed the creatives, and done winning split tests on the sales page. Is anyone seeing similar issues? I've spoken to a lot of businesses who have had a similar experience.

Just had a call with my google rep. He asked if I needed help setting up consent mode on Google. He said it would greatly improve tracking. He mentioned how I should add a banner to ask permission for using cookies. I feel like that would make the page experience worse and decrease conversion rate, especially on mobile because it will literally cover the button to buy the product. I use hyros for tracking so I'm not too worried about the tracking quality without consent mode. Would you reccomend I set this up?