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If you are using automated bidding strategies in Google Ads, there will be some tools you won't be able to use, as Google Ads doesn't allow any manual bid changes in campaigns with automated bidding strategies. Here's a breakdown of the available tools for such a case. 

Optmyzr tools like Shopping Campaign Management and Negative Keywords Finder - Shopping will work for you irrespective of the bidding strategy you are using. The Shopping Negatives will only give you suggestions for the campaigns that are enabled.

Using the Shopping Campaign Management tool, you can also create a structure for a paused campaign so you can enable it later. You can also refresh the paused campaigns to create or remove product groups or ad groups.

Shopping bid management tools such as Shopping Bidder, Attribute Bidder, and Rule Engine (for product groups). This is only limited because Google Ads doesn't allow manually editing bids for product groups if your campaign is set on Automated bidding strategies.

If you'd like to take control of how you should be bidding on the product groups, you'd need to change the bidding strategy to Manual or ECPC bidding. This will allow you to use Bidding tools from Optmyzr to make changes to your product groups. Or, you could also use the Rule Engine to adjust the Target ROAS at the campaign or Ad Group level when using the Target ROAS bidding strategy.