I am a little rusty at this as I haven't monkied with my BI system since I got it up and running a while back. But, if I understand you correctly, hook your Tapo to your regular house wireless. Access your Tapo over your household lan. Find where you can change the Tapo IP. Now put in the IP you want your Tapo to be on your second nic. Save. You will loose your Tapo over your household lan. Reboot Tapo. Should show up on BI. I am assuming you have some sort of wireless ap hooked to your BI network. I utilized an old router I had sitting around. Someone please correct me if I messed up my explanation... haven't done this in a couple of years.