ASHP flow and return pipes

[Pete]

Just about to put my Norstone cladding on the exterior of the house and need to ensure the ASHP pipes look the part!!

I have put in some ducting and now need to decide how to finish the pipes off so it creates a nice junction as it passes through the Norstone. The ASHP will be sited approx 1 metre from the pipes and about 300mm from the wall. I know I need flexi pipes to limit the vibration but can I go with one long pipe from ASHP through the ducting and make the connection to internal pipework inside thus avoiding a right angled union outside or do I need to have a right angled union as the bend will not work without a 90 connection? ( Hope this makes sense) I could site the ASHP nearer than 1 metre if it means I can do away with the 90 union. TIA