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I have looked at in detail, and personally DIY'd auto-filling SIPs. Also I've interrogated OG sippers and scraped the internet for anecdotals on this topic. I have strong opinion as a result that the best method is an elevated large feeder rez (like a 30gal on a on a small stool) that drops gravity-fed water into a "control bucket", on-demand, by a three-position mechanical float valve that predetermines water depth in control bucket - but control bucket has a separate equalization line going out to each SIP and connecting to it at its lowest point the reservoir meaning SIPs and control bucket height of water will be the same.