H M - 1) Sunlight is no less necessary to good health than fresh air. 2) Sunlight is necessary to good no less health than fresh air. 3) Sunlight is no less necessary than fresh air to good health.
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H M-1) and 3) are both fine, though 3) separates the combination "necessary to", making it a bit awkward.
1) Sunlight is no less necessary to good health than fresh air.
2) Sunlight is necessary to good no less health than fresh air. ...
3) Sunlight is no less necessary than fresh air to good health.