If your going to build a kit yourself or want to customise an existing kit, you can get a sandwich plate with a 45° output, like:
https://trackformula.co.uk/product/racinglines-oil-cooler-thermostatic-sandwich-plate-adapter/
https://turbozentrum.co.uk/Universal-Sandwich-Plate-with-Thermostat-and-Sensor-Ports-M20x15-and-3-4-16UNF?curr=GBP&gclid=Cj0KCQiA0fr_BRDaARIsAABw4EuF71gVGeUb2QneHCoxY06uO-EDIyaPaByZrEKPjLTUbWoU_OG2h2waAk--EALw_wcB
For reference the Jackson Racing kit for our cars comes with a sandwich plate with this design.
When I spoke to Rogue about using AN Banjo fittings on the oil cooler, they advised against using them as they are known to leak.