Looking for a Comprehensive Ad Spend Data Platform: Suggestions Needed

Hey everyone, I’m looking for a platform that provides reliable ad spend data for companies, ideally with monthly budget estimates across multiple ad platforms like Google Ads, Meta (Facebook & Instagram) Ads, TikTok Ads, LinkedIn Ads, and others. I checked SpyFu, but it only covers Google Ads and doesn’t provide insights into Meta or other ad networks. I’m looking for a more comprehensive tool that can estimate total ad spend across multiple channels. Does anyone know of a good platform for this? Free or paid—I'm open to all suggestions as long as the data is accurate and useful. Thanks in advance for any recommendations!