Abstract: This study systematically investigates the effects of internal configurations of tandem plate anchors on their embedment behavior through a series of drag embedment tests. Particular emphasis is placed on evaluating how the connection type between the front and rear anchors, the inter-anchor spacing, and the specific types of plate anchors involved (tandem drag-embedment anchors, tandem vertically loaded anchors, and mixed configurations of drag-embedment anchor and vertically loaded anchor (VLA)) affect the embedment trajectory and installation bearing capacity. The results indicate that the padeye-to-fluke connection could enhance both embedment depth and installation capacity. An anchor spacing of no less than three times the fluke width effectively mitigated interference effects. Among the tested configurations, the arrangement with a drag embedment anchor as the front anchor and a vertical load anchor as the rear anchor exhibited the best performance, achieving a maximum installation capacity up to 1.3 times the sum of the corresponding single-anchor capacities. This study provides a theoretical reference for the optimal design and engineering application of tandem plate anchors in deep-water mooring systems.