Question about Google Pixel Buds Pro 2

Hello I currently use an iPhone and wanted to know whether these headphones can be used with IOS devices. It would be important to know whether the ANC control works properly without an Android device and whether you can connect two devices to the headphones? If you can connect multiple devices, do the headphones change the device source "seamlessly"? For example, if I have paused the sound on my iPhone and then play the sound on my Mac, do the headphones automatically switch to the Mac? Last but not least, I wanted to know what the return policy is. My ear canals are relatively small and I've been struggling to find the right earbuds that sit really deep in my ear canal for ANC to work well. Now I was wondering if I could return the headphones if they didn't fit at all. Thank you in advance for your help!