Phil ... with mecanical injection is sometime advisable to have injectors on top of butterfly throttles in order to have an equivalent ratio of air and fuel but also prevet on cold start to fill too much fuel directly to the cylinders causing misfiring and spark missing !
On the 908 Porsche tested both postions and finally the best result at Le mans for fuel comsumption was on top of stack and not directly onto the head ( watch how high my red stacks are in my RSR 3 l engine
Modern engines with ECU management can have those very close to the valve because there is always a plenum giving plenty of air into the stacks and fuel quantity is driven by ecu and lambda of course
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