Unable to bridge Helix 2

Hi,

today videotron came to install helix fiber internet at my shop. First thing I wanted to do after the tech left was to put the helix 2 in bridge mode in order to use my Asus GT-AXE11000 router. I was told by the rep and tech that I would be able to bridge the helix 2 in their app. However, it seems like I can't do so, I'm getting this warning "Bridge Mode not supported in Ethernet WAN mode.". 

Now my question is, is there a way for me to bypass this limitation or can I use another modem model which would let me configure my network  as I please?

Thank you in advance for your help, hopefully someone out there's got the answer I'm looking for!