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The SIDDHARTA-2 collaboration at the INFN Laboratories of Frascati (LNF) aimsto perform groundbreaking measurements on kaonic atoms. In parallel and beyondthe ongoing kaonic deuterium, presently running on the DA$\Phi$NE collider atLNF, we plan to install additional detectors to perform further kaonic atoms'studies, taking advantage of the unique low energy and low momentum spread$K^-$ beam delivered by the at-rest decay of the $\phi$ meson. CdZnTe devicesare ideal for detecting transitions toward both the upper and lower levels ofintermediate-mass kaonic atoms, like kaonic carbon and aluminium, which have animportant impact on the strangeness sector of nuclear physics. We present theresults obtained in a set of preliminary tests conducted on DA$\Phi$NE, in viewof measurements foreseen in 2024, with the twofold aim to tune the timingwindow required to reject the extremely high electromagnetic background, and toquantify the readout electronics saturation effect due to the high rate, whenplaced close to the Interaction Region (IR). In the first test we usedcommercial devices and electronics, while for the second one both werecustomized at the IMEM-CNR of Parma and the University of Palermo. The resultsconfirmed the possibility of finding and matching a proper timing window whereto identify the signal events and proved better performances, in terms ofenergy resolution, of the custom system. In both cases, strong saturationeffects were confirmed, accounting for a loss of almost 90\% of the events,which will be overcome by a dedicated shielding structure foreseen for thefinal experimental setup.

CdZnTe detectors tested at the DA{\Phi}NE collider for future kaonic atoms measurements