Question about TP-Link Cpe510

As Dudis has already written, you need TWO CPE510s directed exactly at each other, which then form their own (directional) radio network. The 2 devices then form a bridge, at the outer end of which you need a switch to distribute the signal (since the devices bundle their signal, the outer receiver only radiates all around to a limited extent).
The purpose of the great CPE510 is to bridge a WLAN signal over large (km-wide!) distances. You probably need something else for your garden WLAN.
Do you know the outdoor WLAN module from devolo (dLAN)?

Hello - I do not have a Swisscom router. In principle, however, it can be said that this device can be connected to any LAN port of a switch, regardless of the provider or manufacturer. In my case, two devices connect over a line-of-sight distance of approx. 100 metres without any problems and with a data throughput that is absolutely sufficient for surfing, streaming music, etc. The device can also be connected to the LAN port of a switch. As an alternative, the devices from UBIQUITI are highly recommended.