The getType() method conflicts with the getType() in the TileEntity class

I think the general recommendation here is not to implement IPeripheral on your tile entity itself. This means you have a hard dependency on CC, which is generally not what you want.

Instead, implement IPeripheral in a separate class and register an IPeripheralProvider for your actual TE.

Do you know any mods that did it?

Not on 1.14 - I'm not aware of any mods using CC so far. However, the API is pretty much identical in previous versions. On 1.12, there's Computronics, which is a pretty good model.