The most reliable solution is the cable without daisy chain any activated devices. 1500ft PoE+ Switch doesn't require PoE extenders at the middle. It is only the PoE adapter at the edge for return the signal over ultra-long distance. What you can bury underground now is just the cable.
PoE StandardIEEE802.3bt/atNetworking Interfaces(4) 10/100 Mbps PoE Ports(2) 10/100 Mbps uplink PortsPoE Port1-4 (only port #1 and #2 supports 800 meters long-distance PoE, the second POE adapter is sold separately.)PoE Total60WPower Supply65WMax. Power Port #1 #230.28W (328ft), 26.58W (984ft), 23.46W (1648ft), 17.56W (2500ft)IndicatorPWR LNK/ACT PoENetwork Media (port #1)100BASE-TX: UTP category 5, 5e cable (0500m), 10BASE-TX: UTP category 5, 5e cable (500800m)Bandwidth1.2GbpsSurge ProtectionDifferential mode±2KVCommon mode ±6KV Just Cable between the Switch and POE Adapter Technical Specifications