Aim for 7.5W if you can afford one.
Not all of them are expensive. Yeah Apple has one listed for $59 but this one on Apple Store is $40 - mophie wireless charging pad
https://store.apple.com/xc/product/HN7V2ZM/A
I also found a few on Amazon but not sure if they are “safe” to use with the new 11 Pro (or does it even matter?) I don’t want the charger to damage the battery in my new phone.
1. YOUSTOO FC01 Wireless Charger, Ultra-Slim Qi-Certified 7.5W USB-C Wireless Charging Pad Compatible with iPhone 11/11 pro/Xs Max/Xs/Xr/8/8 Plus, 10W Compatible Galaxy S10/S10 Plus/S10E/S9, 5W AirPods
https://www.amazon.com/dp/B07QK6WF5N/ref=cm_sw_r_cp_api_i_o1IFDbZ30SXPH
2. Yootech Wireless Charger Qi-Certified 10W Fast Wireless Charging Compatible with iPhone 11/11 Pro/11 Pro Max/XS MAX/XR/XS/X/8/8Plus, Galaxy Note 10/Note 10 Plus/S10/S10 Plus/S10E(No AC Adapter)
https://www.amazon.com/dp/B079KZ49PJ/ref=cm_sw_r_cp_api_i_J1IFDbVD81K3H
3. Anker Wireless Charger, Powerwave Pad Upgraded 10W Max, 7.5W for iPhone 11, Pro, Max, XS Max, XR, XS, X, 8, Plus, 10W Fast-Charging Galaxy S10 S9 S8, Note 10 Note 9 Note 8 (No AC Adapter)
https://www.amazon.com/dp/B07THHQMHM/ref=cm_sw_r_cp_api_i_51IFDb31WTSR1
4. Belkin Boost Up Wireless Charging Pad 7.5W - Fast iPhone Wireless Charger for iPhone XS, XS Max, XR, X, 8, 8 Plus, AirPods 2 (Compatible w/ Samsung, LG, Sony, more)
https://www.amazon.com/dp/B075M59ZB7/ref=cm_sw_r_cp_api_i_A2IFDb4PDDN99
And then there are some that say 10w wireless charging. I don’t know what to do lol