@Ash Dell Optiplex PC are reasonably priced. My advice is to buy an Optiplex PC for your business and install BI there. Make sure BI is on same switch as your cameras.
Steps:
#1: Get cameras and BI working at your business. While connected to your business wifi, use your laptop browser to connect to local BI URL like
http://192.168.11.211:81 (replace 192.168.11.211 with your BI server local IP address, replace 81 with your BI port if necessary).
***If you can do #1, then end-2-end, you have everything working locally at the business.
#2: Remote access: On business router, configure port forwarding for BI port. Then go home, Starbucks or somewhere else , use your laptop browser, try to connect to your business external IP address at configured external port. (Do not port forward your cameras.)
#3: BI has a great mobile app. Download BI mobile app and repeat access like in #1 and #2.
#4: For more security, turn off port forwarding in step #2 and configure VPN on router. Using your laptop or phone at remote location, connect to your business VPN. Upon successful VPN connect, test BI access via local BI URL from #1.