USB to RS485 Module with MODBUS-RTU RS485 Soil Sensor on Raspberry Pi 4B

If I purchase 2 of the USB to RS485 Module from DFRobot (https://www.dfrobot.com/product-2189.html) and 2 types of soil sensors which require that USB converter (https://www.dfrobot.com/product-2819.html) + (https://www.dfrobot.com/product-2818.html), then can I use both on the Raspberry Pi 4B as it has 4 USB ports? And how do I set up the sensors with this USB converter for the Raspberry Pi 4B?