Here’s a question that pops up a lot:
“Does it make sense to add bid adjustments to smart bidding campaigns?”
Short answer: No. Almost never.
Longer answer: It depends.
Here’s a table that clearly summarizes when bid adjustments CAN be added:
And here’s what Google has to say:
“If you are using Smart Bidding strategies, powered by Google AI, including Target CPA, Target ROAS, Maximize conversions, and Maximize conversion value, you don’t need to make manual bid adjustments since those strategies automatically set bids to optimize for the conversion goal specified by the customer.
If you make a manual bid adjustment to your automated Smart Bidding strategy, it won’t be supported.
Device bid adjustments for Target CPA allows you to modify the value of your CPA target, rather than the bids themselves.“
Source: https://support.google.com/google-ads/answer/2732132?hl=en
– Nils