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Spiders can't reach as high. Unless you make them really big, but then they take up a lot of space

Humans are very space efficient

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Something vaguely centauroid is probably would be the most middle of the road design: easy to maintain steady balance with 4 legs without taking too much of the floor space, the central column on top of it can go quite high up and easily have up to 4 hand-like manipulators attached to it with wide range of motion.
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The mechanical spider can simply extend its torso or body up. You are only bounded by your imagination!
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Actually bipedal systems are very energy efficient when walking and moving and very slightly inefficient when standing still.
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