Some of the difficult parts of my job are where to position the prizes as well as fixing the glitches in the machines.
この場合、次のような言い方ができますよ。
ーSome of the difficult parts of my job are where to position the prizes as well as fixing the glitches in the machines.
「私の仕事の難しいところは、賞品の配置や機械の不調を直すことです」
to position the prizes で「賞品を（特定の場所に）配置する」
to fix the glitches in the machines で「機械の不調を直す」
ご参考まで！
カナダ 
