In this case, it looks like your highpoly is a contiguous surface while the low poly is split into multiple objects - it won't be possible to bake a mesh like this without some sort of seam or artifact where the low poly objects intersect. I would suggest merging the low into a contiguous, water-tight mesh that matches the high. Alternatively you could break apart the high poly mesh and use bake groups, but merging the low will be easier and bake better.
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In this case, it looks like your highpoly is a contiguous surface while the low poly is split into multiple objects - it won't be possible to bake a mesh like this without some sort of seam or artifact where the low poly objects intersect. I would suggest merging the low into a contiguous, water-tight mesh that matches the high. Alternatively you could break apart the high poly mesh and use bake groups, but merging the low will be easier and bake better.