Yep, that LaView instruction is the same instructions as Ezviz, Imou, Dmss, etc. I knew in H1 of this year where someone who had a LaView Halo ONE variant got Alexa skills to work. However, the ONVIF FW wasn't released back then so my RCA unit was still on the older RCA FW until a couple months ago. Since I haven't seen any RCA HSDB2A owner mention Alexa, thought I'd ping this thread for any recent success stories in advance of my Echo Show devices arriving from Amazon. I only have Google minis so no Google hub to test with. I'll continue to use my wall mounted tablets to view the security cameras until I can figure out how to get Alexa working with RCA HSDB2A.
When I did an Alexa search 2 pages came up. Just be sure to search this thread