New H1B application by multiple employers

Hi, I am aware that we can apply for new h1b through multiple employers and need to select any one employer before going for stamping.
But, I am not sure whether applying through multiple employers is still applicable? I mean we can follow this method in 2021 March application?
Coz, USCIS is changing the rule frequently.
Your advice would be helpful. Thanks.

I have a quick question about h1b application through multiple employers. Is it really the case that two companies can file registration and petition for the same candidate ? Any resources in reference to this will also be super helpful
Thank you very much