Yes, and which ones depends on your markets – idealo matters in Germany, Ceneo in Poland, Prisjakt across the Nordics. Microsoft Ads is a genuine second channel and it is also what Copilot and ChatGPT search sit on, which makes it worth more than its share of search suggests. With comparison sites the whole game is product feed quality and bidding, not "switch it on and forget". Getting a feed off Shopify that those channels are happy with is not as turnkey as it is on a local platform, but it is entirely solvable – I set it up and keep tuning it.