Please correct me if I'm wrong Emile...
Usually the topology is internet - modem (coax, fibre, DSL copper, analog, etc) - router - switch - computer. Mainstream routers and those provided by your ISP often include a modem and some switching functionality. The Taiko router will be a classical router without a dedicated modem with the potential exception of fibre internet. Meaning:
Case 1: you have NO fibre internet (DSL or coax copper, analog or similar) --> you will need to use your existing modem and connect this to the configured WAN port of the Taiko router.
If you currently have a router including the modem provided by your ISP (internet service provider), there are three options...
Case 1a: your ISP allows you to replace the all in one router with a dedicated modem (DSL, coax, etc). This leads to case 1.
Case 1b: you have to use the ISP's all in one router but it can be configured in bridge mode (either by yourself or by your ISP). This leads again to case 1 as it configures your device as modem, de-activating the router, switch, wifi, etc.
However some of the ISPs don't allow you to use your own router and force you to use their's. This leads to case 1b...
Case 1b: your ISP forces you to use their all in one router. In this case you can only use the Taiko router subsequent to your ISP device.
Case 2: you have fibre internet and your ISP provided you with a specific SFP fibre module.
Case 2a: Also in this case, some of the ISPs force you to use their all in one device which leads us to case 1b. But if you're lucky, your ISP allows you to use an own router of your choice - jackpot! This leads us to case 2b...
Case 2b: your fibre ISP allows you to use an own router. In this case you can configure the SFP port on the Taiko router as WAN port and directly use the SFP module provided by your ISP to connect to the internet without any other modem. Usually this involves some configuration in router according to ISP advice (e.g. VLAN and DHCP option). I assume that the Taiko router will be able to support this.
So hands down, it will depend on your situation, internet technology and ISP which topology applies.
My assumption is that scenario 2b is the most promising option for maximum sonic impact and therefore I would check which available ISP allows you to use your own fibre router (in case fibre is available in your location).
@engadin as you are living in Switzerland... In case you have access to fibre, 2 ISPs I know of that do so are Unit7 and Sunrise but others may as well.
I hope I could help to shed some light into this topic. Please feel free to ask if something is still unclear.
Markus