It is unclear how light or heavy these armour plates are, but it looks innovative and practical.
Rheinmetall BAE Systems Land (RBSL) revealed details of two new armour solutions, called the Telford Enhanced Spaced Armour (TESA) and the Telford Enhanced Ceramic...
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It is a good, well known, and established solution against small arms fire (limit appears to be the lower end of medium caliber rounds).
It does need to come as a complementary defense behind another sheet of armor to avoid exterior damage. And it is not very useful for prolonged conflicts.
An alternative solution currently in study is metal foam, which promises to be effective against a wider range of munitions.
But overall it appears most users prefer heavier holistic armor solutions like ERA that utilizes level 4 or 5 armor plates at the exterior.
Perforated armor provides excellent per hit effect over weight, but loses quite a lot of structural strength for that, which is deemed by many to be a not so good trade-off.
It's important to remember that angle of impact is a crucial aspect of armor technology against any threat.
Looking above the IMO outdated STANAG 4569 armor standard levels, practically every armor is a reactive one - whether the explosive type (ERA or SLERA), or the nicer more balanced ones (NERA or NxRA).
Reactive armor types are able to exponentially increase their effectiveness according to the impact angle of the projectile, which explains why they're practically as good as paper when they're perpendicular to the projectile. This is not because the angle merely adds more line of sight thickness, but because the outer blown plate of a reactive armor block can transfer more of its energy to the projectile, whether it's an APFSDS, or HEAT.
As NxRA becomes increasingly viable on light armored vehicles, and ERA can be seen on AFVs sub 20 tons, and can protect certain AFVs sides against things like RPGs, the idea of perforated armor approaches more and more the market of low cost, low end solutions. So I don't see it being widely adopted anywhere. But as an emergency upgrade it might be quite popular.