This is an adapter plate for the housing "Enclosure for WT32-ETH01 + 4x Relay's + DS18b20" to fit in 2 DAC and one power board / Step-down Module. Can be seen as printed in blue on the photos.

Besides the WT32-ETH01 board, these are the components used:

0-10V DAC: DFR0971 / GP8403 from DFRobot https://wiki.dfrobot.com/SKU_DFR0971_2_Channel_I2C_0_10V_DAC_Module

Power board / Step-down Module: LM2596S Step-down Module https://cdn.shopify.com/s/files/1/1509/1638/files/LM2596S_Display_Datasheet_ad089409-86d7-435a-b8d4-6c8276aa09b4.pdf?v=1702373797

You need to remove two studs from the original enclosure in order to connect the ground cables to the DACs.