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https://en.wikipedia.org/wiki/Spike_(missile)
The Spike missile uses a tandem warhead – two shaped charges, a precursor warhead to detonate any explosive reactive armor and a primary warhead to penetrate the underlying armor.
This cross section of Spike shows both the precursor ands main HEAT warheads are forward directed. If that is correct, then the only way to conduct top attack is a flight path that ends in a (shallow or steep) dive onto the armored target.
The SPIKE warheads are clearly not directed down, as is the case with e.g. the Swedish RBS-56 BILL and TOW 2B (see below), which overfly their targets (horizontally).
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See also
http://www.army-guide.com/eng/product3670.html
NORMAL TOW
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TOP ATTACK TOW
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Which would suggest a similar approach is used as with LAHAT. That missile’s trajectory can be set to match either (top attack) armoured fighting vehicle, warship, or helicopter gunship (direct attack) engagements. The LAHAT missile hits the target at an accuracy of 0.7 m (2.3 ft) CEP and an angle of over 30 degrees, providing effective penetration of up to 800 mm (31 in) of RHA armor steel with its tandem warhead to deal with add-on reactive armor.
The dimensions of LAHAT are diameter 105 mm , length 975mm, weight 13kg, warhead 10kg.
The dimensions of SPIKE-ER are 170mm diameter, length 1,670 mm, weight ground launch (missile 14 kg + 9kg command and launch unit) .
In the video above (post #46) it indeed says "lofted trajectory for top attack" at 0:57, which means 'high approach", like with LAHAT. Since Spike has a larger diameter, and this determines the punch of the main HEAT charge, I would expect Spike to have clearly greater penetration power than LAHAT
Correct me if you think I'm wrong but AFAIK there is not tank in service today that has 800mm of RHA equivalent protection on the top, not even with ERA.
Illustrated below is the difference between direct attack (METIS M) and top attack (Spike)
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Lebanese ground forces operate the following AT weapons: M72 LAW, RPG-7, Bofors AT4, M40 recoilless rifle, BGM-71 TOW, MILAN (VAB Mephisto), ATR-14 Kornet. Jordan has Javelin. As do Saudi Arabia and all Gulf states (Bahrain, Oman, Qatar and UAE).