Hmmm...personally, I wouldn't do this in PROD. If you have to, I'd download and host this API in house in your shop. Most current web servers set CORS headers by default. I'd set those headers in the web.config on the root of your web server.
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A public demo of CORS Anywhere is available at https://cors-anywhere.herokuapp.com. This server is only provided so that you can easily and quickly try out CORS Anywhere. To ensure that the service stays available to everyone, the number of requests per period is limited, except for requests from some explicitly whitelisted origins.
If you expect lots of traffic, please host your own instance of CORS Anywhere, and make sure that the CORS Anywhere server only whitelists your site to prevent others from using your instance of CORS Anywhere as an open proxy."