SPA8800 is nothing more than 4 pcs. of SPA3102 housed together, like SPA8000 is 4 pcs. of SPA2102.
Minor differences in ports, etc. as all 4 SPAs in the box share the same IP address. The SPA2102/3102 use ports 5060 and 5061, while the SPA8000/8800 use ports 5160 & 5161, 5260 & 5261, 5360 & 5361 for second to fourth SPA2102/3102.
You may consider configuring SPA8000/8800 manually following the guidelines for SPA2102/3102.
Regards