Hello, I have bought recently a Peplink SOHO for home application. Currently I have the ISP router in bridge mode and DHCP, SOHO works fine with a maximum speed limit of 170MB/sg.
If you are planning to connect the Peplink SOHO with the ONT using PPPoE the only drawbak is that SOHO does not supports IEEE802.1p, this implies that you will not be able to use the telephony and TV services provided by the ISP through the optic fiber.
There is a request of another user by 2016 requesting the IEEE801.1p support but it seems it is not a Peplink priority. I have also commented this subject with the local distributor of Peplink at my country, and he has also requested this capability that probably is not a must for office usage but it is a drawback for home applications.
If you do not require or plann to use telephony or TV services of the ISP, SOHO is fine for the application, you can connect it with the ONT through PPPoE configuring the user, password in SOHO, enabling VLAN tick and intruducing the VLAN ID of the Internet service.
I recommend you to be sure that you can get this information before changing the ISP, in my country for example, ISP does not provide the user and password information, and you have to manage to get it out from the router provided, which sometimes it is not easy, probably in your case this is not an issue.