Either way should work , as long as there is no air in the system and you pump is located lower then your highest hoses then drain back will keep fluids in the pump and will make it self priming every time you start the pump , as always the lower the better but if it is working at the height its at then you know it can be that high
No heater hoses are not good for 90 deg bends but if you go to a store like advance you will find ready bend 3/4 hoses that are not to costly that are 4-5 feel in length and have a 90 on one end , I walk in and ask to go look at there heater hose rack and and measure and pick out what I need , if you go to a mobile home supply place you can find plastic 3/4 barbed fittings that work well and I have used them over the years for up to 250 deg hoses with no issues
I hope that helps
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