I have Tigo optimisers installed on 38 panels here in the UK, facing from NE to SW. They work well and are a significant advantage when different parts of the roof face in different directions and some are shaded at different times. Tigo support were good when there was a setup problem (some panels not connecting to the network - sorted remotely). They connect to my 8kW Sunsynk inverter and this setup gives a wide spread in time of solar energy - a long smooth flat curve through the day - better than if panels were all facing south.