We haven´t investigated this topic yet. Please note that CONTROLLINO (MAXI and MEGA) are using WIZnet W5100 as the original Arduino Ethernet Shield. I have seen only some articles about Ethercat with Arduino Ethernet Shiled 2 which uses W5500.
I think Ethercat has compatibility with MAXI because I remember I have used them on the laptop that I had bought from the [url=https://www.reecoupons.com/view/inateck]Inateck[/url] coupon. Why you have doubts in this thing? Haven’t you did this before?